244 lines
7.3 KiB
C
244 lines
7.3 KiB
C
/******************************************************************************
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*
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* Module Name: evxfregn - External Interfaces, ACPI Operation Regions and
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* Address Spaces.
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <linux/module.h>
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#include <acpi/acpi.h>
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#include <acpi/acnamesp.h>
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#include <acpi/acevents.h>
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#define _COMPONENT ACPI_EVENTS
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ACPI_MODULE_NAME("evxfregn")
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/*******************************************************************************
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*
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* FUNCTION: acpi_install_address_space_handler
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*
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* PARAMETERS: Device - Handle for the device
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* space_id - The address space ID
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* Handler - Address of the handler
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* Setup - Address of the setup function
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* Context - Value passed to the handler on each access
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*
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* RETURN: Status
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*
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* DESCRIPTION: Install a handler for all op_regions of a given space_id.
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*
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******************************************************************************/
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acpi_status
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acpi_install_address_space_handler(acpi_handle device,
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acpi_adr_space_type space_id,
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acpi_adr_space_handler handler,
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acpi_adr_space_setup setup, void *context)
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{
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struct acpi_namespace_node *node;
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acpi_status status;
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ACPI_FUNCTION_TRACE("acpi_install_address_space_handler");
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/* Parameter validation */
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if (!device) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Convert and validate the device handle */
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node = acpi_ns_map_handle_to_node(device);
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if (!node) {
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status = AE_BAD_PARAMETER;
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goto unlock_and_exit;
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}
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/* Install the handler for all Regions for this Space ID */
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status =
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acpi_ev_install_space_handler(node, space_id, handler, setup,
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context);
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if (ACPI_FAILURE(status)) {
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goto unlock_and_exit;
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}
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/* Run all _REG methods for this address space */
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status = acpi_ev_execute_reg_methods(node, space_id);
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unlock_and_exit:
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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return_ACPI_STATUS(status);
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}
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EXPORT_SYMBOL(acpi_install_address_space_handler);
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/*******************************************************************************
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*
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* FUNCTION: acpi_remove_address_space_handler
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*
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* PARAMETERS: Device - Handle for the device
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* space_id - The address space ID
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* Handler - Address of the handler
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*
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* RETURN: Status
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*
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* DESCRIPTION: Remove a previously installed handler.
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*
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******************************************************************************/
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acpi_status
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acpi_remove_address_space_handler(acpi_handle device,
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acpi_adr_space_type space_id,
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acpi_adr_space_handler handler)
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{
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union acpi_operand_object *obj_desc;
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union acpi_operand_object *handler_obj;
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union acpi_operand_object *region_obj;
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union acpi_operand_object **last_obj_ptr;
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struct acpi_namespace_node *node;
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acpi_status status;
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ACPI_FUNCTION_TRACE("acpi_remove_address_space_handler");
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/* Parameter validation */
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if (!device) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Convert and validate the device handle */
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node = acpi_ns_map_handle_to_node(device);
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if (!node) {
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status = AE_BAD_PARAMETER;
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goto unlock_and_exit;
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}
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/* Make sure the internal object exists */
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obj_desc = acpi_ns_get_attached_object(node);
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if (!obj_desc) {
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status = AE_NOT_EXIST;
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goto unlock_and_exit;
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}
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/* Find the address handler the user requested */
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handler_obj = obj_desc->device.handler;
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last_obj_ptr = &obj_desc->device.handler;
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while (handler_obj) {
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/* We have a handler, see if user requested this one */
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if (handler_obj->address_space.space_id == space_id) {
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/* Matched space_id, first dereference this in the Regions */
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
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"Removing address handler %p(%p) for region %s on Device %p(%p)\n",
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handler_obj, handler,
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acpi_ut_get_region_name(space_id),
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node, obj_desc));
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region_obj = handler_obj->address_space.region_list;
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/* Walk the handler's region list */
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while (region_obj) {
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/*
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* First disassociate the handler from the region.
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*
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* NOTE: this doesn't mean that the region goes away
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* The region is just inaccessible as indicated to
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* the _REG method
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*/
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acpi_ev_detach_region(region_obj, TRUE);
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/*
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* Walk the list: Just grab the head because the
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* detach_region removed the previous head.
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*/
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region_obj =
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handler_obj->address_space.region_list;
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}
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/* Remove this Handler object from the list */
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*last_obj_ptr = handler_obj->address_space.next;
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/* Now we can delete the handler object */
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acpi_ut_remove_reference(handler_obj);
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goto unlock_and_exit;
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}
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/* Walk the linked list of handlers */
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last_obj_ptr = &handler_obj->address_space.next;
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handler_obj = handler_obj->address_space.next;
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}
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/* The handler does not exist */
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
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"Unable to remove address handler %p for %s(%X), dev_node %p, obj %p\n",
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handler, acpi_ut_get_region_name(space_id), space_id,
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node, obj_desc));
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status = AE_NOT_EXIST;
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unlock_and_exit:
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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return_ACPI_STATUS(status);
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}
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EXPORT_SYMBOL(acpi_remove_address_space_handler);
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